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Add the sqlite3session_config() interface. For configuring global parameters

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belonging to the sessions module.

FossilOrigin-Name: 1e69f3ff057b0be27a9e79842de2485f8299799f309e89bfa7597dd688e0975b
This commit is contained in:
dan
2018-10-26 17:05:00 +00:00
parent f689400dc7
commit 1f48e67db1
6 changed files with 126 additions and 17 deletions
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37
ext/session/sqlite3session.c
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@ -25,6 +25,8 @@ typedef struct SessionInput SessionInput;
# endif
#endif
static int sessions_strm_chunk_size = SESSIONS_STRM_CHUNK_SIZE;
typedef struct SessionHook SessionHook;
struct SessionHook {
void *pCtx;
@ -2397,12 +2399,12 @@ static int sessionGenerateChangeset(
rc = sqlite3_reset(pSel);
}
/* If the buffer is now larger than SESSIONS_STRM_CHUNK_SIZE, pass
/* If the buffer is now larger than sessions_strm_chunk_size, pass
** its contents to the xOutput() callback. */
if( xOutput
&& rc==SQLITE_OK
&& buf.nBuf>nNoop
&& buf.nBuf>SESSIONS_STRM_CHUNK_SIZE
&& buf.nBuf>sessions_strm_chunk_size
){
rc = xOutput(pOut, (void*)buf.aBuf, buf.nBuf);
nNoop = -1;
@ -2614,7 +2616,7 @@ int sqlite3changeset_start_v2_strm(
** object and the buffer is full, discard some data to free up space.
*/
static void sessionDiscardData(SessionInput *pIn){
if( pIn->xInput && pIn->iNext>=SESSIONS_STRM_CHUNK_SIZE ){
if( pIn->xInput && pIn->iNext>=sessions_strm_chunk_size ){
int nMove = pIn->buf.nBuf - pIn->iNext;
assert( nMove>=0 );
if( nMove>0 ){
@ -2637,7 +2639,7 @@ static int sessionInputBuffer(SessionInput *pIn, int nByte){
int rc = SQLITE_OK;
if( pIn->xInput ){
while( !pIn->bEof && (pIn->iNext+nByte)>=pIn->nData && rc==SQLITE_OK ){
int nNew = SESSIONS_STRM_CHUNK_SIZE;
int nNew = sessions_strm_chunk_size;
if( pIn->bNoDiscard==0 ) sessionDiscardData(pIn);
if( SQLITE_OK==sessionBufferGrow(&pIn->buf, nNew, &rc) ){
@ -3362,7 +3364,7 @@ static int sessionChangesetInvert(
}
assert( rc==SQLITE_OK );
if( xOutput && sOut.nBuf>=SESSIONS_STRM_CHUNK_SIZE ){
if( xOutput && sOut.nBuf>=sessions_strm_chunk_size ){
rc = xOutput(pOut, sOut.aBuf, sOut.nBuf);
sOut.nBuf = 0;
if( rc!=SQLITE_OK ) goto finished_invert;
@ -4895,7 +4897,7 @@ static int sessionChangegroupOutput(
sessionAppendByte(&buf, p->op, &rc);
sessionAppendByte(&buf, p->bIndirect, &rc);
sessionAppendBlob(&buf, p->aRecord, p->nRecord, &rc);
if( rc==SQLITE_OK && xOutput && buf.nBuf>=SESSIONS_STRM_CHUNK_SIZE ){
if( rc==SQLITE_OK && xOutput && buf.nBuf>=sessions_strm_chunk_size ){
rc = xOutput(pOut, buf.aBuf, buf.nBuf);
buf.nBuf = 0;
}
@ -5291,7 +5293,7 @@ static int sessionRebase(
sessionAppendByte(&sOut, pIter->bIndirect, &rc);
sessionAppendBlob(&sOut, aRec, nRec, &rc);
}
if( rc==SQLITE_OK && xOutput && sOut.nBuf>SESSIONS_STRM_CHUNK_SIZE ){
if( rc==SQLITE_OK && xOutput && sOut.nBuf>sessions_strm_chunk_size ){
rc = xOutput(pOut, sOut.aBuf, sOut.nBuf);
sOut.nBuf = 0;
}
@ -5402,4 +5404,25 @@ void sqlite3rebaser_delete(sqlite3_rebaser *p){
}
}
/*
** Global configuration
*/
int sqlite3session_config(int op, void *pArg){
int rc = SQLITE_OK;
switch( op ){
case SQLITE_SESSION_CONFIG_STRMSIZE: {
int *pInt = (int*)pArg;
if( *pInt>0 ){
sessions_strm_chunk_size = *pInt;
}
*pInt = sessions_strm_chunk_size;
break;
}
default:
rc = SQLITE_MISUSE;
break;
}
return rc;
}
#endif /* SQLITE_ENABLE_SESSION && SQLITE_ENABLE_PREUPDATE_HOOK */